Rootless docker install

[key262yek]

I'm trying to install navidrome using rootless docker on Ubuntu 22.04, docker v25.0.3 If I just follows the docker install instruction it fails with 'permission error' I think the way of setting 'uid:gid' via enviromental variable fails in rootless docker. Since the rootful docker work with root user without user variable, rootless docker should work with current user in the same situation. So I deleted user variable and it works fine. I think the instruction for rootless docker should be added.